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Laboratory grows world record length carbon nanotube

LOS ALAMOS, N.M., September 13, 2004 University of California scientists working at Los Alamos National Laboratory in collaboration with chemists from Duke University have recently grown a world record-length four-centimeter-long, single-wall carbon nanotube.

Single-wall carbon nanotubes have a number of revolutionary uses, including being spun into fibers or yarns that are more than 10 times stronger than any current structural material. In addition to uses in lightweight, high-strength applications, these new long metallic nanotubes also will enable new types of nanoscale electro-mechanical systems such as micro-electric motors, nanoscale diodes, and nanoconducting cable for wiring micro-electronic devices.

In research reported in the current online issue of the journal Nature Materials, Yuntian Zhu and his colleagues discuss how they created a single-wall carbon nanotube using a process called catalytic chemical vapor deposition from ethanol (alcohol) vapor. Discovered in 1991 by Japanese scientist Sumio Iijima, carbon nanotubes are cylindrical carbon molecules that are very similar in structure to a fullerene, or buckyball, but instead of being a sphere, the nanotube is tubular in shape. Until the advent of the Los Alamos/Duke discovery, the length of carbon nanotubes had previously been limited to a few millimeters.

Zhu, a scientist in the Materials Science and Technology Division, said, "although this discovery is really only a beginning, the continued development of longer length carbon nanotubes could result in nearly endless applications. Actually, the potential uses for long carbon nanotubes are probably limited only by our imagination."

Long metallic carbon nanotubes can be used to create a bio/chemical sensor in one segment while the rest of the nanotube can act as a conductor to transmit the signal. Other uses include applications in nanoscale electronics, where the nanotubes can be used as conducting or insulating materia
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Contact: Todd Hanson
tahanson@lanl.gov
505-665-2085
DOE/Los Alamos National Laboratory
13-Sep-2004


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